Cognitive radio networks (CRNs) allow an opportunistic access of the unused spectrum to the unlicensed secondary users (SUs) provided that the interference generated by the SUs does not exceed the acceptable interference levels (predefined system threshold) to primary users (PUs). This paper deals with the maximization of transmission range of SUs considering Multi-hop cognitive radio cellular networks (CogCells), where SUs communicate with the Base Station(BS) over multiple hops. The SUs with low transmission power communicate with the BS through other secondary systems(SS) which act as a router to forward packets. The multi-hop transmissions generate more number of scheduled users as compared to Single-hop transmissions. In this paper, a greedy heuristic approximation algorithm (GHAA) is discussed for coverage optimization with the power control algorithms. The simulation results show that the number of scheduled users increase in multi-hop scenario with and without the application of power control algorithms.
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